JP2007118817A - Occupant restraining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an occupant restraining device capable of holding high the internal pressure of a bag. <P>SOLUTION: Fixing parts 12a to a seat pan 8 are provided on the left and right ends of the bag 12, and between them 12a, an air chamber 15 is formed which is inflated with the gas introduced from an inflator 13. The bag 12 is formed by overlapping an upper panel 16 and a lower panel 17 one over another constituting the upper half and the lower half of the outside surface at inflation of the bag 12, in which their peripheral edge parts are adhered to each other using a resilient bonding agent 19 to exhibit an elongation of 200% or more, for example 200-400%, and are sewn together into a sack form. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an occupant restraint device for restraining an occupant of a seat of a vehicle such as an automobile at the time of a collision. The present invention relates to an occupant restraint device configured to prevent.

  As a system for restraining an automobile occupant at the time of a collision, as a occupant restraining device for preventing a submarine phenomenon in which the occupant tries to pass through the lower side of the lap belt at the time of a frontal collision even when a seat belt is worn, JP-A-10-217818 The publication describes an occupant restraint device in which an inflatable bag is disposed between a seat cushion and a seat pan, and the front portion of the seat cushion is pushed up by inflating the bag at the time of a vehicle collision.

  FIG. 7 is a longitudinal sectional view in the front-rear direction of the seat showing the passenger restraint device disclosed in the publication. An airbag 44 is disposed between the cushion frame (seat pan) 40 and the seat pad 42 at the front portion of the seat. The airbag 44 extends in the left-right width direction of the seat and can be inflated by an inflator 46. The upper surface of the seat pad 42 is covered with a trim cover 48, and an occupant sits thereon.

  When the inflator 46 is activated at the time of a vehicle collision, the airbag 44 is inflated, and the front part of the seat pad 42 is pushed up or pushed up from below to increase the density, thereby preventing forward movement of the occupant's body. Included).

Such an airbag 44 is configured by overlapping two conventional woven fabrics and stitching their peripheral portions.
JP-A-10-217818

  A first object of the present invention is to provide an occupant restraint device capable of maintaining a high internal pressure of the bag.

  The second object of the present invention is to increase the production efficiency of this bag.

  The third object of the present invention is to reduce the anisotropy of the expansion rate when a bag made of woven fabric is inflated.

  The occupant restraint device according to claim 1 is an occupant restraint device having an inflatable bag so as to press the front portion of the seat cushion from below and a gas generator for inflating the bag in a vehicle emergency. Is characterized in that the upper and lower sides of the chamber into which the gas is introduced are composed of a plurality of panels that are superposed on each other.

  The occupant restraint device according to claim 2, wherein the occupant restraint device includes an inflatable bag that presses the front portion of the seat cushion from below, and a gas generator that inflates the bag in a vehicle emergency. Is a chamber in which gas is introduced between the panels by overlapping and bonding a plurality of panels, and at least a part of the bonding is an elastic bond having an elongation of 200% or more. It is characterized by adhesion by an agent.

  An occupant restraint device according to a third aspect is characterized in that, in the second aspect, the coupling is a combination of bonding with the adhesive and stitching of the bonded portion.

  The occupant restraint device according to claim 4 is an occupant restraint device having an inflatable bag so as to press the front portion of the seat cushion from below and a gas generator for inflating the bag in a vehicle emergency. Is a chamber in which gas is introduced between the panels by overlapping and joining a plurality of panels, the panels are made of woven fabric, and the direction of the thread lines of at least some of the panels Is oblique to the thread of at least some other panels.

  The occupant restraint device according to claim 5 is characterized in that, in claim 4, the bag is composed of a plurality of panels in which the upper side and the lower side of the chamber into which the gas is introduced are respectively overlapped. It is.

  The occupant restraint device according to claim 6 is the occupant restraint device according to claim 5, wherein two panels are respectively arranged on the upper side and the lower side of the chamber, and the stitches of the panels adjacent vertically are shifted by 40 to 50 °. It is characterized by this.

  As described in the first aspect, by arranging a plurality of upper and lower panels, the expansion ratio of the panels can be dispersed. As a result, the durability of the bag is improved and the internal pressure within the bag can be increased. In addition, by making a plurality of sheets, it is possible to reduce gas leakage that permeates the panel.

  As described in claim 2, gas leakage can be reduced by bonding the panels together with an elastic adhesive having an elongation of 200% or more. For example, when the adhesive application area is sufficiently large, the bag expands and the adhesive breaks and peels off, but the panels are bonded to each other by providing a structure that completes expansion before the end of the panel. A bag can be constructed simply by doing. It is also possible to set the peel strength at the time of bonding between panels to be equal to or higher than the normal sewing strength, and the adhesive applied to the end of the inflated portion has a structure that does not completely break or peel off at the time of expansion. The bag body can be configured only by the above. In this case, since the bag can be configured simply by bonding the panels together, the productivity is greatly improved.

  According to the third aspect, the strength of the bag can be further improved by sewing the portion bonded with the adhesive.

  According to the fourth and fifth aspects, the force applied to the bag by the expansion of the bag can be dispersed as much as possible, and the expansion rate can be made close to uniform.

  According to claim 6, the effect combined with claim 1 can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a seat frame provided with an occupant restraint device according to an embodiment of the present invention when the bag is not inflated, FIG. 2 is a plan view of the bag of FIG. 1, and FIG. 2 is a sectional view taken along line III-III in FIG. 2, FIG. 4 is a sectional view taken along line IV-IV in FIG. 2, and FIG. 5 is a sectional view taken along line V-V in FIG. It is.

  A frame constituting an automobile seat includes a base frame 1 and a back frame 4 rotatably connected to the base frame 1 via a support shaft 2 and a reclining device (not shown). A headrest 6 is attached to the upper portion of the back frame 4. The base frame 1 has left and right side frames 1a and 1b, and a seat pan 8 is installed between the front portions of the side frames 1a and 1b.

  Although not shown, a seat cushion and a seat back made of urethane or the like are mounted on the base frame 1 and the back frame 4. The seat pan 8 is disposed below the front portion of the seat cushion. In addition, the code | symbol 1d of FIG. 1 has shown the spring which supports this seat cushion.

  The occupant restraint device 10 includes an inflatable bag 12 disposed on the upper side of the seat pan 8 so as to press the front portion of the seat cushion from below, and an inflator (gas generating unit) for inflating the bag 12 Instrument) 13. The bag 12 extends in the left-right direction (vehicle width direction) of the seat pan 8. Fixing portions 12 a and 12 a to the seat pan 8 are provided at both left and right ends of the bag 12, and the fixing portions 12 a are fastened to the seat pan 8 by bolts 14. The space between the fixed portions 12a and 12a of the bag 12 is a vacant space 15 that is expanded by introduction of gas from the inflator 13.

  In this embodiment, the bag 12 is composed of an upper panel 16 and a lower panel 17 that constitute the upper half side and the lower half side of the outer peripheral surface of the bag 12 when inflated, and the peripheral edges thereof extend. Is bonded with the elastic adhesive 19 of 200% or more, for example, 200 to 400%, and is sewn into a bag shape. Reference numerals 20 to 22 denote seams made of thread or the like, which are obtained by stitching the panels 16 and 17 together. The seam 20 circulates around the panels 16 and 17 so as to surround the empty room 15.

  As shown in FIG. 2, in this embodiment, each of the panels 16 and 17 has a horizontally long, substantially hexagonal plan view shape in which a pair of opposing sides extend in the left-right direction. Of each panel 16, 17, the portion that protrudes laterally in a substantially triangular shape on both ends in the left-right direction is a fixed portion 12a to the seat pan 8, respectively. An insertion hole 12b for the bolt 14 is provided. In the vicinity of the center of the lower panel 17, a stud bolt insertion hole 12 c through which a stud bolt 18 a of a retainer 18 described later is inserted is provided.

  The vacancies 15 are formed between the fixed portions 12a and 12a by sewing the peripheral portions of the portions between the fixed portions 12a and 12a of the panels 16 and 17 with the seam 20 over the entire circumference. Has been. As shown in FIG. 2, the seam 20 is extended in a horizontally long substantially oval shape.

  Specifically, the seam 20 has a pair of left and right extending portions extending in the left and right direction along the pair of opposing sides of the panels 16 and 17 (reference numeral 20L is added to FIG. 2). Part) and one end side and the other end side of both the left and right direction extending portions are connected to each other, and extend in a substantially circular arc shape so as to protrude toward both end sides in the left and right direction of each panel 16 and 17. It has a pair of substantially arcuate parts (reference numerals omitted).

  As shown in FIG. 5, the distance L from the edge of the panels 16 and 17 of the left and right extending portion 20L of the seam 20 is preferably 15 mm or more, for example, about 15 to 30 mm, particularly about 20 mm.

  The adhesion width W of the elastic adhesive 19 is preferably about 7 to 15 mm. The seam 20 is preferably located in a range of ± 3 mm near the center of the elastic adhesive 19 in the width direction.

  The seam 21 stitches the peripheral portions of the overlapping bolt insertion holes 12b of the panels 16 and 17 together. In addition, the seam 22 sews the peripheral portions of the fixing portions 12a and 12a on the left end side of the panels 16 and 17 and the peripheral portions of the fixing portions 12a and 12a on the right end side. As shown in FIG. 2, both ends of each seam 22 join the seam 20, and the vicinity of the middle joins the seam 21.

  In this embodiment, a rod-shaped inflator 13 is disposed in the bag 12. The inflator 13 extends so that the longitudinal direction is the vehicle width direction. The inflator 13 has a gas ejection port (not shown) on its side peripheral surface, and is configured to eject gas in the radial direction from the gas ejection port.

  As shown in FIG. 5, a retainer 18 for fixing the inflator 13 to the seat pan 8 is connected to the inflator 13. A stud bolt 18 a is projected from the retainer 18. The stud bolt 18 a is inserted into the stud bolt insertion hole 12 c on the lower surface (lower panel 17) of the bag 12 and extends outside the bag 12. As shown in the figure, the stud bolt 18a is inserted into a stud bolt insertion hole (reference numeral omitted) of the seat pan 8, and a nut 18b is tightened to the stud bolt 18a from the back (lower) side of the seat pan 8, whereby the retainer The inflator 13 is fixed to the seat pan 8 together with 18, and the vicinity of the center in the left-right direction of the bag 12 is sandwiched and fixed between the retainer 18 and the seat pan 8.

  The bag 12 is folded along the upper surface of the seat pan 8 so that the width in the front-rear direction is reduced. However, the bag 12 may be folded after being attached to the seat pan 8, or may be folded in advance and attached to the seat pan 8 in a state of being retained by a shape retaining member (not shown).

  In this embodiment, the width of the bag 12 in the front-rear direction is set by flattening the bag 12 and folding the front half side and the rear half side toward the center side of the bag 12 from the middle in the front-rear direction. It is small. However, the folding method of the bag 12 is not limited to this, and zigzag folding (bellows folding) may be performed a plurality of times, or the bag 12 may be folded in a roll shape. Further, the bag 12 may be arranged flat without being folded.

  The operation of the occupant restraint device 10 is as follows.

  When a frontal collision of the automobile is detected, the inflator 13 performs gas ejection operation, and the bag 12 (empty chamber 15) is expanded by the gas from the inflator 13. As a result, the front part of the seat cushion is pushed up or pushed up from below, and the density increases, and forward movement of the occupant's waist is prevented or suppressed.

  Since the fixing portions 12a, 12a at both ends of the bag 12 are fixed to the seat pan 8 by bolts 14, even if a load is applied to the bag 12 inflated from the passenger, the bag 12 It is prevented or suppressed from moving forward.

  In this occupant restraint device 10, the panels 16 and 17 are coupled by using the elastic adhesive 19 and the seam 20 together, and this coupling is strong. The elastic adhesive 19 provides a gas seal effect. For this reason, the internal pressure of the inflated bag 12 is kept high for a long time.

  In this embodiment, the panels 16 and 17 are combined by the combined use of the elastic adhesive 19 and the seams 20 to 22. However, the adhesive force of the adhesive 19 is sufficiently high, and the panels 16 and 17 are expanded when the bag 12 is inflated. If they are not separated from each other, as shown in FIG. 8, the panels 16 and 17 may be joined together only by the adhesive 19. In this case, the adhesive 19 may not be peeled off at all when the bag 12 is inflated. The adhesive 19 is peeled off on the vacant space 15 side of the bag 12, but the panels 16 and 17 are adhesive on the bag outer peripheral side. It is good also as a structure adhere | attached by 19.

  In the above embodiment, the inflator 13 is installed inside the bag 12, but the inflator may be installed outside the bag. FIG. 6 is a plan view of the bag showing a configuration example of the bag when the inflator is installed outside the bag.

  In the bag 12A of FIG. 6, a hose-shaped duct portion 30 is extended from one end side (near one fixed portion 12a) in the longitudinal direction (left-right direction). The base end side of the duct portion 30 communicates with the vacant chamber 15. A gas supply member (for example, a pipe or the like) from the inflator is inserted into the duct portion 30, and the two are coupled by a band (not shown) or the like. As a result, gas is introduced into the empty chamber 15 from the inflator installed outside the bag 12 </ b> A via the gas supply member and the duct portion 30.

  Other configurations of the bag 12 are substantially the same as those of the bag 12 shown in FIGS. 1 to 5. In FIG. 6, the same reference numerals as those in FIGS. 1 to 5 denote the same parts.

  In the present invention, as shown in FIG. 9, the upper and lower sides of the vacant room may be constituted by a plurality of panels (in FIG. 9, two panels 16A, 16B, 17A, and 17B, respectively). Thereby, the expansion | extension rate of the panels 16 and 17 can be made small, and the tolerance of a bag can be improved. Moreover, the gas leak which permeate | transmits a panel can also be suppressed. The panels 16A to 17B may be the same material or different materials (for example, those having different expansion rates).

  Although only the seam 20 is shown in FIG. 9, the seam 20 and the elastic adhesive 19 may be used in combination as shown in FIG.

  When a plurality of panels are used, the direction of the threads of the woven fabric constituting the panels may be obliquely crossed.

  FIG. 11 shows an example thereof, and the stitches of the panels 16A, 16B, 17B, and 17A are shifted by 45 °. By shifting the stitches in this way, the force applied to the bag can be dispersed and the stretch rate can be made as uniform as possible in each direction.

  In this embodiment, the extending direction of the seam 20 is oblique to the thread of any panel, so that the yarn does not shift at the seam portion.

  In the embodiment shown in FIGS. 1 to 5, the bag 12 is fixed to the seat pan 8 with bolts 14 at both ends in the longitudinal direction, and the middle part in the longitudinal direction is disposed in the bag 12. The retainer 18 (stud bolt 18a) is fixed to the seat pan 8. In the present invention, when the middle part in the longitudinal direction of the bag is fixed to the seat pan by a fixing member such as a retainer, the fixing to the seat pan at both ends in the longitudinal direction of the bag may be omitted. Good. FIG. 12 is a plan view of the bag 12B configured as described above.

  The bag 12B shown in FIG. 12 has a structure in which the fixing portions 12a and 12a on both ends in the longitudinal direction of the bag 12 in the embodiment shown in FIGS. 1 to 5 are cut out from one end in the longitudinal direction. The inside of the vacant chamber 15 is inflatable over almost the entire length up to the other end side.

  Other configurations of the bag 12B are the same as those of the bag 12 in the embodiment shown in FIGS. 1 to 5. In FIG. 12, the same reference numerals as those in FIGS. 1 to 5 denote the same parts.

  The middle portion of the bag 12B in the longitudinal direction is fixed to the seat pan 8 via a bolt insertion hole 12c by a retainer 18 (stud bolt 18a) disposed therein. Both end sides in the longitudinal direction of the bag 12B are not fixed to the seat pan 8.

  However, the attachment structure of the bag to the seat pan is not limited to the configuration of each embodiment described above, and the bag may be attached to the seat pan by an attachment structure of another configuration.

  Each of the above embodiments shows an example of the present invention, and the present invention is not limited to each of the above embodiments.

It is a perspective view at the time of bag non-inflation of a frame of a seat provided with an occupant restraint device concerning an embodiment. It is a top view of a bag. It is sectional drawing which follows the III-III line of FIG. It is folding explanatory drawing of a bag. It is the VV sectional view taken on the line of FIG. 1 at the time of expansion | swelling of a bag. It is a top view of the bag concerning an embodiment. It is a longitudinal cross-sectional view of the seat front-rear direction showing an occupant restraint device according to a conventional example. It is sectional drawing of the bag which concerns on embodiment. It is sectional drawing of the bag which concerns on embodiment. It is sectional drawing of the bag which concerns on embodiment. It is explanatory drawing of the thread of the panel of the bag which concerns on embodiment. It is a top view of the bag concerning an embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base frame 1a, 1b Side frame 4 Back frame 6 Headrest 8 Seat pan 10 Occupant restraint device 12, 12A, 12B Bag 12a Fixing part 12b Bolt insertion hole 13 Inflator 14 Bolt 15 Empty room 16, 16A, 16B, 17, 17A, 17B Panel 19 Elastic adhesive 20-22 Seam

Claims (6)

A bag that is inflatable to press the front part of the seat cushion from below;
A gas generator for inflating the bag in a vehicle emergency;
In an occupant restraint system having
The occupant restraint device, wherein the bag is configured by a plurality of panels, each of which is superimposed on the upper side and the lower side of a chamber into which gas is introduced. A bag that is inflatable to press the front part of the seat cushion from below;
A gas generator for inflating the bag in a vehicle emergency;
In an occupant restraint system having
The bag forms a chamber into which gas is introduced between the panels by overlapping and bonding a plurality of panels.
An occupant restraint device characterized in that at least a part of the connection is adhesion by an elastic adhesive having an elongation of 200% or more.   3. The occupant restraint apparatus according to claim 2, wherein the coupling is a combination of bonding with the adhesive and stitching of the bonded portion. A bag that is inflatable to press the front part of the seat cushion from below;
A gas generator for inflating the bag in a vehicle emergency;
In an occupant restraint system having
The bag forms a chamber into which gas is introduced between the panels by overlapping and bonding a plurality of panels.
The panel is made of woven fabric,
An occupant restraint device characterized in that the direction of the thread of at least some panels is oblique to the thread of at least some other panels.   5. The occupant restraint apparatus according to claim 4, wherein the bag is configured by a plurality of panels in which an upper side and a lower side of a chamber into which gas is introduced are overlapped. In claim 5, two panels are respectively arranged above and below the chamber,
An occupant restraint device characterized in that the yarns of adjacent panels vertically deviate by 40 to 50 °.

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